WO2015120642A1

WO2015120642A1 - Weighing structure for grain dryer and grain dryer comprising the structure

Info

Publication number: WO2015120642A1
Application number: PCT/CN2014/072505
Authority: WO
Inventors: 吴文福; 韩峰; 张亚秋; 刘哲; 张立辉; 吴玉柱; 吴新怡
Original assignee: 长春吉大科学仪器设备有限公司
Priority date: 2014-02-17
Filing date: 2014-02-25
Publication date: 2015-08-20
Also published as: JP3208807U; CN103808394B; CN103808394A

Abstract

Disclosed is a weighing structure for a grain dryer, comprising an upper shape-changing extension base (3) and a lower shape-changing extension base (7). The upper extremity of an extension rod (4) has an adjustable longitudinal length and is fixed onto the upper shape-changing extension base (3). A pressure sensor (6) is fixed onto the lower shape-changing extension base (7). The lower extremity of the extension rod (4) is fixed onto the pressure sensor (6) via a fine-tuning screw (9). Also disclosed is a grain dryer comprising the weighting structure. The weighing structure is fixed onto a support rod of the dryer, is convenient to install, service, and replace, and is suitable for continuous and circulating driers.

Description

Weight measuring structure of grain dryer and grain dryer including the same

Technical field

The present invention relates to a device for measuring weight, and more particularly to a structure for weighing a grain dryer and a grain dryer including the same.

Background technique

On-line detection of moisture during grain drying is critical to precise control of the drying process. The existing on-line measurement and control methods for dry moisture of grain use the capacitance method or the electric resistance method to realize on-line detection of moisture, which has the disadvantages of poor stability and low precision, and can not meet the demand of moisture detection under complicated working conditions. Chinese Patent Application No. 200920102075.5 discloses an on-line moisture monitoring device for fruits and vegetables in a freeze-drying process. The device uses a double-connected cantilever beam load cell as a detecting component, and measures dry weight on-line sampling of dry materials. The absolute value of the rate measurement error can be controlled within 0.5%. China Invention Patent Publication No. CN 101736565 A discloses a laundry dryer having a weight detecting device and a control method of the dryer using the same. Chinese Invention Patent Publication No. CN 103438693 A An automatic control system for a gas jet dryer is disclosed that uses a load cell for moisture measurement and control. In the above patents, weighing is used as a means of detecting moisture, but in the patent, the weighing sensors are installed inside the drying equipment, the bottom of the material tray or the drying chamber, which is not suitable for later maintenance and disassembly, especially for grain drying equipment. Online moisture detection.

The above-mentioned patent uses the weighing method as a method for moisture detection and an application for controlling drying equipment, and can accurately and intuitively monitor and control the process of moisture content and water loss rate of dry materials. This method can also be applied as a grain drying equipment for the detection and control of grain moisture during the drying process, but the installation and maintenance of the load cell is a key issue in the application of the method.

Applicant applied for the patent application of China Application No. 201310682597.8 for the circulating grain dryer, and proposed the online moisture measurement and control method and system based on the total weight detection. In the application, the effect of surpassing the performance of the traditional circulating dryer measurement and control method was obtained. However, in the invention, the conventional weighing sensor is directly installed on the base of the dryer as the weight on-line detecting device, and there are still disadvantages in that installation and maintenance are inconvenient.

technical problem

The invention provides a moisture on-line detecting device suitable for a dryer which is convenient to install, convenient for later maintenance, high precision and stable and reliable, and is suitable not only for a circulating grain dryer but also for a continuous grain dryer.

Technical solution

The weight measuring structure of the grain dryer comprises an upper deformation extension seat and a lower deformation extension seat, the extension rod can be adjusted and fixed on the upper deformation extension seat, and the length of the upper end of the extension rod is adjustable, and the length of the extension seat can be adjusted; the pressure sensor is fixed On the lower deformation extension, the lower end of the extension rod is adjustably fixed to the pressure sensor by means of a fine adjustment screw.

As a further preferred method, a protective cover is further included, and the protective cover is fixedly connected to the deformed extension seat and the lower deformation extension seat, or the protective cover is fixed on the column of the dryer base; and is used for sealing dustproof.

The lower deformed extension seat is provided with a protective screw having a gap between the protective screw and the pressure sensor in the vertical direction.

As a further preference, the upper end of the extension rod has a thread and passes through the upper deformation extension seat, and the extension rod is respectively locked with a nut on both sides of the upper deformation extension seat.

As a further preferred, the fine adjustment screw is a knurled grub screw that is adjustably threaded into the threaded bore of the pressure sensor.

A grain dryer comprising the weight measuring structure of the grain dryer described above, characterized in that the weight measuring structure is fixed on a pillar of a dryer base.

As a further preferred, the pillar is a cylindrical steel pipe.

As a further preferred, the pillar is a channel steel or an I-beam.

As a further preference, the upper deformed extension seat and the lower deformed extension seat clamp the cylindrical steel tube through the double card movable seat.

As a further preference, the upper deformed extension seat and the lower deformed extension seat are fixed to the channel steel or the I-beam by means of welding.

Beneficial effect

The structure for measuring the weight of the grain dryer of the present application has the advantages of convenient installation, maintenance and replacement, and is suitable for continuous and circulating dryers, and has the characteristics of low maintenance cost and good fixing effect.

DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic view showing the structure of a continuous dryer of the present invention.

2 is a schematic view showing the deformation and extension structure of the circular steel pipe pillar of the present invention.

Fig. 3 is a second schematic view showing the deformation and extension structure of the circular steel pipe pillar of the present invention.

Figure 4 is a partial enlarged view of the pressure sensor of the present invention.

Fig. 5 is a schematic view showing the deformation and extension structure of the channel steel pillar of the present invention.

Fig. 6 is a second schematic view showing the deformation and extension structure of the channel steel pillar of the present invention.

Fig. 7 is a schematic view showing the deformation and extension structure of the I-beam of the present invention.

Fig. 8 is a second schematic view showing the deformation and extension structure of the I-shaped steel pillar of the present invention.

Figure 9 is a schematic view showing the structure of a dryer of the present invention.

Figure 10 is a schematic view showing the installation of the circulating dryer of the present invention.

Embodiments of the invention

实施例一：Embodiment 1:

Referring to FIG. 1 and FIG. 10, the present invention adopts a deformed extension structure, which is installed on a supporting column of a base of a continuous dryer. When the grain is filled in the dryer I, the column is deformed by pressure to generate an axial deformation. The structure also produces a slight deformation with the deformation of the column, thus transforming the deformation of the column into a deformation applied to the pressure sensor by the pressure extension rod in the deformation extension mechanism of the load cell device II. The pass signal detection and conversion unit III of the pressure sensor 6 converts the amount of deformation into an electrical signal, and is amplified and converted and transmitted to the control and display unit IV. The leveler V uses a continuous level sensor to detect the grain height in the dryer in real time and transmits the data to the control and display unit IV to calculate the grain volume in the dryer.

The installation form of the deformed extension structure can be divided into different installation manners according to the form of the base of the dryer. Figure 2 and Figure 3 As shown, when the base of the dryer base adopts a circular steel pipe, the upper and lower deformation extension seats adopt a double-card movable seat connection form; that is, the inward side of the upper extension seat and the lower extension seat have grooves, grooves and a circle. The outer circumference of the steel pipe is anastomosed and passed through the screw 2 Fasten with the nut. As shown in Figure 5 and Figure 6, when the base of the dryer is made of channel steel, the upper and lower deformed extensions are connected by double welded joints; Figure 7 and Figure 8 As shown, when the strut of the base of the dryer is made of I-beam, the upper and lower deformed extensions are also connected by a double welded mount.

The dryer load cell device II comprises a plurality of sets of load cells mounted on the base pillar of the dryer body 1. As shown in Figure 1. As a preferred example, the load cell group may be composed of four or more deformed extension structures having the same principle, structure, size, material, range and precision. The deformed extension structure includes an upper deformation extension seat 3, a lower deformation extension seat 7, an extension rod 4, a pressure sensor 6, a protection screw 8, a fine adjustment screw 9, and a protective cover 5. The function of the upper deformation extension seat 3 is mainly to fix the extension rod 4, and the main function of the lower deformation extension seat 7 is to fix the pressure sensor 6. The upper deformed extension seat 3 and the lower deformation extension seat 7 are fixed to the pillar 1 of the dryer base by means of a double card movable seat, a screw, a welding or a fixing seat. The extension rod 4 adopts a threaded rod, and the upper end is fixed to the upper deformation extension seat 3 by a double nut, and the length of the deformation lead extension 3 is extended by the adjustment thread rod, so that the upper and lower adjustment and locking can be realized. The pressure sensor 6 is fixed to the lower deformation extension seat 7 by screws. The pressure sensor 6 has a threaded hole on the cantilever. The pressure sensor 6 is provided with a fine adjustment screw 9 at a point of application, and the fine adjustment screw 9 is mounted with a knurled grub screw. The pressure sensor 6 is in the threaded hole at the point of application of the force, and the fine adjustment screw 9 can be adjusted by rotation to extend the fine adjustment screw 9 to the outside of the threaded hole or shorten the threaded hole, thereby increasing or decreasing the preload force, so that the extension rod 4 is pressed against the pressure. The sensor 6 applies an appropriate preload force. When the strut 1 of the dryer base is deformed, the extension rod 4 acts on the fine adjustment screw 9, and finally the pressure sensor 6 is deformed. As a preference, in order to prevent the pressure sensor from being damaged by overload, the protective screw 8 is installed under the pressure point of the pressure sensor 6, and the protective screw 8 is mounted on the lower deformation extension seat 7 by using a flat hexagonal screw. A suitable gap is left between the top of the protective screw 8 and the pressure sensor 6. When the pressure sensor 6 is overloaded, the lower end of the cantilever beam of the pressure sensor 6 is in contact with the protection screw 8, so that the bending deformation of the cantilever beam of the pressure sensor 6 is no longer increased, and the sensor is protected. As a preferred embodiment, a protective cover 5 is externally attached to the entire structure, and the protective cover 5 can be fixed on the column 1 of the dryer base or fixed on the upper and lower extension seats; the purpose is to avoid the influence of dust, rain, snow, wind and the like. The gap between the pressure sensor and the fixed seat is filled, which affects the measurement accuracy and damages the instrument.

As shown in Figure 1, when the dryer body 1 When the weight change of the internal grain moisture causes the change of the weight of the column, the deformation amount of the column is changed by the external load, and the deformed extension seat 3 and the lower deformation extension seat on the deformation and extension mechanism 7 It is fixed on the base pillar 1 by double-card movable seat, screw, welding or fixing seat, and there is no relative displacement between the pillar 1 and the pillar 1 due to the load deformation, and is converted into the upper deformation extension. seat A slight change in the relative distance between the 3 and the lower deformed extension seat 7, the extension rod 4 fixed to the upper deformation extension seat 3 acts on the pressure sensor 6 fixed above the lower deformation extension seat 7, so that the pressure sensor 6 The strain gauge on the upper surface is elastically deformed, the resistance value changes, is converted into a voltage signal through the bridge circuit, and the voltage signal is transmitted to the signal detecting and converting unit III.

As shown in FIG. 9, the signal detecting and converting unit III collects and converts voltage signals. The unit is composed of an amplification filter circuit, an analog-to-digital conversion circuit, a watchdog line, an MCU signal processor, and an RS485 serial communication line.

The amplification filter line is placed in front to eliminate noise and amplify the signal. It is then connected to the analog-to-digital conversion line and is responsible for converting the analog signal into a digital signal that can be received by the host computer. The MCU signal processing circuit is then connected to the analog to digital conversion circuit to process the received digital signal. The watchdog line is connected to the MCU line to prevent the program from being locked or lost. Finally, the processed signal is connected to the control display unit IV through the RS485 serial communication line.

After the voltage signal passes through the filter amplification circuit, the noise is filtered out, the interference signal is eliminated, and the signal value is amplified. The voltage signal processed by the filter amplification still belongs to the analog quantity and cannot be received by the host computer. At this time, the signal is converted into a digital signal that can be received by the host computer through the analog-to-digital conversion line. The digital signal is calculated by the MCU signal processing line. MCU signal processing circuit is the single chip signal processing circuit.

When the MCU system is running, there are occasional phenomena such as program loss, memory failure, external interference, or incorrect operation, causing the system to enter an infinite loop and fail to work properly. The watchdog circuit needs to be added. The basic function of the watchdog line is to initialize the program after a problem occurs in the software operation and the program is disordered. This allows the system to be reset as soon as the system encounters such interference, which greatly improves the stability of the machine itself. At this time, the digitized, stable, and processed signal is transmitted to the control and display unit IV.

实施例二：Embodiment 2:

Referring to Fig. 2, this embodiment is a change on the basis of Embodiment 1, and the same points are not repeated, except that the dryer main body 1 is a circulating grain dryer, and the dryer operation mode is a batch operation. The leveler V adopts the switch type material level, that is, when the height of the grain inside the dryer reaches the height position of the leveler, the grain stop is stopped, the drying operation is started, and the new grain to be dried is not input before the drying operation is completed. Real-time collection of the weight loss of grain in the dryer.

The above description of the embodiments is intended to facilitate the understanding and application of the present invention by those skilled in the art. It will be apparent to those skilled in the art that various modifications can be readily made to these embodiments and the general principles described herein can be applied to other embodiments without the inventive work. Therefore, the present invention is not limited to the embodiments herein, and those skilled in the art should be able to make modifications and changes without departing from the scope of the invention.

Industrial applicability

The invention provides the weight measuring structure for the weight detection of the dryer, has the advantages of high precision, good reliability, and the like, and can be applied to the on-line control of grain moisture, and has good industrial applicability.

Claims

The weight measuring structure of the grain dryer comprises an upper deformation extension seat and a lower deformation extension seat, wherein the extension rod is adjustablely fixed on the upper deformation extension seat, and the length of the upper end of the extension rod is extended and the deformation extension seat can be adjusted. The pressure sensor is fixed on the lower deformation extension seat, and the lower end of the extension rod is fixedly fixed to the pressure sensor by a fine adjustment screw.
The weight measuring structure according to claim 1, further comprising a protective cover fixedly connected to the deformed extension seat and the lower deformation extension seat, or the protective cover is fixed on the column of the dryer base Used to seal dust.
The weight measuring structure according to claim 1 or 2, wherein the lower deforming extension seat is provided with a protective screw having a gap between the protective screw and the pressure sensor in a vertical direction.
The weight measuring structure according to claim 1 or 3, characterized in that the upper end of the extension rod has a thread and passes through the upper deformation extension seat, and the extension rod is respectively locked with a nut on both sides of the upper deformation extension seat.
A weight measuring structure according to claim 1 or claim 3 wherein the fine adjustment screw is a knurled grub screw that is adjustably threaded into the threaded bore of the pressure sensor.
A grain dryer comprising the weight measuring structure of the grain dryer according to any one of claims 1 to 5, wherein the weight measuring structure is fixed to a pillar of the dryer base.
A grain dryer according to claim 6, wherein said pillar is a cylindrical steel pipe.
A grain dryer according to claim 6, wherein said pillar is channel steel or I-beam.
A grain dryer according to claim 7, wherein the upper deformed extension and the lower deformed extension clamp the cylindrical steel pipe through the double card movable seat.
The grain dryer according to claim 8, wherein the upper deformed extension seat and the lower deformed extension seat are fixed to the channel steel or the I-beam by welding.